We have a large in-ground pool with a vinyl liner. Our pool has a vermiculite bottom and when we get a fairly good rain we get a bubble that pushes the liner up. After recent heavy rains the bubble has risen to 3 to 5 ft across and actually breaks the surface of the water on the shallow end of the pool (3 feet deep). We've had one engineer come out and talked about well points, but would not guarantee that it would fix the problem. Just put a new liner in this year. Need help on a permanent solution. :eek:

I asssume the bibble is water filled and not air, right? For the liner to raise up like this with water there must be more hydrolic pressure under the liner than from the weight of the water inside the pool. What is the topograhy around the pool and the drainage. You may need to dig the equivalent of a sump pump pit next to the pool, line it and pump away excess ground water.